JP3177535B2 - Support device for impact moving tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a hydraulically or pneumatically operated impact tool, that is, a breaker, which is widely used for crushing, demolition work, etc. in a quarrying site, a civil engineering construction site, and the like.
The present invention relates to a device for supporting a tip of a boom such as a power shovel.

[0002]

2. Description of the Related Art An impact power tool is used by being attached to the end of a boom of a self-propelled bogie such as a power shovel. The impact power tool vibrates violently up and down during operation. If transmitted as it is, it will adversely affect the bogie and the operator.

Conventionally, as shown in FIG. 7, both sides of an impact power tool 1 and a pair of opposed brackets 3 attached to the tip of a boom 2 such as a power shovel are conventionally supported by two support brackets 4. , 5 with a vibration-isolating rubber 6 interposed therebetween
To prevent vibration from being transmitted to the truck or operator.

[0004]

By the way, in order to efficiently crush rocks, concrete structures and the like by the impact power tool 1, the tip of the chisel 8 of the impact power tool 1 is strongly pressed against the object to be crushed. Activate the impact tool 1
The so-called chisel 8 must be prevented from being hit.

However, when the tip of the chisel 8 of the impact power tool 1 is strongly pressed against the crushed object by operating the boom cylinder, an excessive force in the shear direction is applied to the vibration isolating rubber portion. In particular, as shown in FIG. 1, when the axis of the impact power tool 1 is not perpendicular to the object to be crushed but is inclined at a certain angle, the impact power tool 1 is centered on the tip of the chisel 8 in the bracket 3. To rotate in the direction of arrow B, a large rotational force (torsion force) is constantly applied to the vibration isolating support member 7 that supports the impact moving tool 1 and the bracket 3, thereby causing the vibration isolating support member 7 to rotate. Of the vibration-proof rubber 6 easily becomes fatigued. Further, when the power tool is strongly pressed, the impact power tool 1 moves in the direction A with respect to the bracket 3, and there is a problem that a large shear load is applied to the anti-vibration rubber to break it.

In view of the above, the present invention provides an anti-vibration device in which even if an impact power tool is strongly pressed against a crushed object, a rotational force is not applied to an anti-vibration support member that supports both sides of the impact power tool and the bracket. The purpose is to prevent the support member from being damaged.

[0007]

In order to solve the above-mentioned problems, the present invention provides a shock absorbing member which is fixed to the lower surface of a top bracket attached to the tip of a boom facing the upper surface of an impact power tool. The stopper member is fixed to one of the lower surface of the impact tool and the upper surface of the impact moving tool, and the other is provided with a guide concave portion for holding the periphery of the stopper member slidably in the vertical direction.

[0008]

[Function] When the boom cylinder is operated and the tip of the chisel of the impact power tool is strongly pressed against the object to be crushed, even if the axis of the impact power tool is inclined with respect to the object to be crushed, The upper surface is held by the stopper member and the guide member so as to be slidable up and down with respect to the lower surface of the top bracket, and can be moved only slightly in a direction perpendicular to the axis. rotation of the tool is deter of <br/> is, damage of the vibration-proof supporting member is prevented.

[0009] Further, since a cushioning member is attached between the upper surface of the impact power tool and the lower surface of the top bracket,
Most of the reaction force in the A direction against the pressing force when the tip of the impact power tool is pressed against the crushed object is applied to the cushioning member, and the stress applied to the vibration isolating support member is reduced.

[0010]

An embodiment of the present invention will be described below.

The impact power tool 10 comprises a chisel 11 and an impact power tool main body 12, and is supported by a bracket 15 attached to a tip of a boom 14 of a self-propelled carriage 13 such as a power shovel, as shown in FIG. Have been.

The bracket 15 is used to move the impact moving tool main body 1.
2 are provided facing each other so as to sandwich both sides, and at the upper end,
Top bracket 16 attached to the tip of boom 14
Of the lower plate 17, taken with plate 20 that is secured by bolts 19 via a spacer 18 is provided.

An anti-vibration support member 23 that fits into support recesses 22 provided on both side surfaces of the impact tool body 12 is provided with bolts 24 on the opposing surfaces of the pair of opposing brackets 15 on the upper side.
Has been fixed by.

As shown in FIG. 4, the anti-vibration support member 23 has a mounting table 26 formed on an inner surface of a fixing plate 25 which is fixed to the bracket 15 by bolts 24. the plate 27 is fixed by a bolt 2 1, the upper surface of the lower metal plate 27, the rubber plate 28, the thin metal plate 29, the rubber plate 30, which successively provided an upper metal plate 31, the upper surface of the upper metal plate 31 impact The power tool main body 12 is adapted to engage with the upper wall of the support recess 22. Further, in a state where the vibration isolating support member 23 is fitted into the support recess 22 of the impact tool body 12 and the impact tool body 12 is supported by the bracket 15, the lower surface of the mounting table 26 of the fixing plate 25 and the support recess 22 are supported. A predetermined space is provided between the lower surface and the lower surface of the device.

The anti-vibration support member 23 constructed as described above
Since a force is applied to the rubber plates 28 and 30 in the compression direction, the load resistance of the rubber plates 28 and 30 is large. Instead of such an anti-vibration support member 23, an anti-vibration support member 23 having a structure shown in FIGS. 5 and 6 can be used.

That is, the anti-vibration support member 23 of the embodiment shown in FIGS. 5 and 6 includes a support fitting 32 fitted into the support recess 22 of the impact tool body 12 and a bolt 33 attached to the bracket 15.
And a fixing plate 34 fixed by a rubber plate 35. And in this example,
The rubber plate 35 is located in the through hole 36 formed in the bracket 15, and a force in the shear direction is applied to the rubber plate 35.

Spacers 37 and 38 are attached to the upper and lower opposing surfaces of the pair of opposing brackets 15 with bolts 39 so as to leave a gap slidable with respect to the side surface of the impact tool body 12. Have been. The spacers 37 and 38 are formed of a hard resin such as hard nylon.

Next, on the lower surface of the spacer 18 attached to the lower plate 17 of the top bracket 16, Mounting plate 2
An annular rib 41 that fits into the through hole 40 is formed. A buffer member 45 in which a fixing plate 42, a cushion rubber 43, and a receiving plate 44 are sequentially joined is fitted inside the annular rib 41, and the fixing plate 42 is fixed to the spacer 18 by bolts 46. The fixing plate 42 and the receiving plate 44 of the buffer member 45 are formed of steel.

A mounting frame 47 is integrally formed on the lower surface of the receiving plate 44, and a stopper member 48 made of hard resin such as hard nylon is mounted on the mounting frame 47. The lower portion of the stopper member 48 is
, And slides up and down in a guide recess 49 formed on the upper surface of the impact power tool main body 12.
It is housed and held with some gap in the direction perpendicular to the axis. The lower end surface of the stopper member 48 and the guide recess 49
A predetermined space is provided between the base and the bottom surface. This space is smaller than the space formed between the lower surface of the mounting table 26 of the vibration isolating support member 23 and the lower surface wall of the support concave portion 22. , The upper surface of the impact power tool 10 comes into contact with the lower end surface of the stopper member 48, and a pressing force is applied to the buffer member 45.

Through holes 50 are formed in the fixing plate 42, the cushion rubber 43, and the receiving plate 44 of the cushioning member 45 so that the worn stopper member 48 can be pushed out for replacement . .

In the above embodiment, the stopper member 48 is fixed to the buffer member 45 side. However, the stopper member 48 is fixed to the impact tool body 12 side, and the guide recess 49 is fixed to the buffer member 4.
It may be provided on the fifth side. Further, the buffer member 45 and the guide recess 49 are formed in a cylindrical shape, and the stopper member 4 is formed.
Preferably, 8 is formed in a cylindrical shape.

[0022]

As described above, according to the present invention, since the upper end of the impact power tool is held by the lower surface of the top bracket, the lower end of the impact power tool is strongly pressed against the object to be crushed. In this case, even if the axis of the impact power tool is inclined with respect to the crushed object, the rotation of the impact power tool is prevented. Also,
When the anti-vibration support member shown in FIGS. 2 and 4 is used, the cushion rubber receives a compressive load instead of a shear load even if it is strongly pressed by a power shovel, so that it can withstand a larger pressing load. Therefore, the stress applied to the anti-vibration support member that supports both side surfaces of the impact power tool is reduced, so that the anti-vibration support member is prevented from being damaged and the effect of being able to be attached to a larger power shovel is also achieved. is there.

Further, since the vibration isolating support member is located at the upper end of the impact moving tool, there is also an effect that the spacer interval between both sides of the impact moving tool and the bracket can be reduced. Furthermore, if the cushioning member is formed in a cylindrical shape, a load in any direction perpendicular to the axis due to torsion or twisting of the chisel tip portion is buffered, and movement of the impact power tool with respect to the bracket is limited, so that the vibration isolating support member The durability increases.

[Brief description of the drawings]

FIG. 1 is a diagram showing a use state of an impact moving tool.

FIG. 2 is a partially longitudinal front view showing the upper half of the embodiment.

FIG. 3 is a partially longitudinal front view showing the lower half of the embodiment.

FIG. 4 is an exploded perspective view of an anti-vibration support member.

FIG. 5 is a partially longitudinal front view showing the upper half of another embodiment.

FIG. 6 is a cross-sectional view of the above.

FIG. 7 is a partially longitudinal front view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Impact moving tool 11 Chisel 12 Impact moving tool main body 13 Self-propelled trolley 14 Boom 15 Bracket 16 Top bracket 17 Lower plate 22 Support recess 23 Vibration-proof support member 45 Buffer member 48 Stopper member 49 Guide recess

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02F 3/36 B25D 17/24

Claims (3)

(57) [Claims] 1. An impact power tool supporting device for supporting both side surfaces of an impact power tool and a pair of opposed brackets attached to the tip of a boom such as a power shovel by a vibration isolating support member. A buffer member is fixed to the lower surface of the top bracket attached to the end of the boom facing the boom, and a stopper member is fixed to one of the lower surface of the buffer member or the upper surface of the impact tool, and the other side is vertically moved around the stopper member. A support device for an impact power tool, comprising a guide recess for slidably holding in a direction. 2. The support device according to claim 1, wherein said stopper member is made of a hard resin. 3. The impact power tool support device according to claim 1, wherein the buffer member and the stopper member have a cylindrical shape.